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Change 240v 110v - Bosch Water Heaters

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Posted on Nov 19, 2013

Testimonial: "Thank you very much for the solution to my problem. I have an electric hot water heater and I am switching to nat.gas, the new nat gas heater needs a 120 volt plug to run a fan to exhaust the fumes outside, I figured I could use the same wire from the breaker box to the electric water heater and just switch it from 240v to 120v and wire in a electical box and plug in the end of the wire that is now on the electric water heater thus saving running another wire and having one dead, I didnt know how to wire the main breaker box to do this but with your pictures I have figured it out, just take out the 240 breaker and switch it for a 120 breaker and leave the one red hot wire capped off. Thanks again."

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Posted on Jan 02, 2017

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1 Answer

I have a 110v whirlpool 30gal. Hot water heater burning up element


If it's a 110v and it's getting 220v then you need to just call an electrician to wire it correctly.

Feb 21, 2015 | Whirlpool Water Heaters

1 Answer

Woke up to no hot water changed out both heating elements and both thermostats meter says wiers are hot checked breaker its got power still no hot water any suggestions


Water heater can test for power, but is only receiving 120V instead of 240V.
Test that upper thermostat is getting 240V across top two screws of thermostat.

http://waterheatertimer.org/Test-electricity-to-water-heater.html

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 28, 2011 | Reliance & 40 Gal Electric Mobile Home...

1 Answer

PowerStar AE9.5 isn't working. Bought new. Water lines are hooked up to the correct water lines. The 240V wire coming from the breaker is hooked up as follows: Uncovered copper wire connected to ground,...


Hi,
The unit will not owrk unless you have 240V ACROSS the black and white wires...if you do not have that coming to the unit then you have a bad breaker...

heatman101

Feb 19, 2011 | Bosch PowerStar AE9.5 AE9.5 Point-of-Use...

1 Answer

I have replaced the bottom element,and now i have no hot water. I check with a meter and have power to the top element but not the bottom one.


First of all, you have 240V water heater because tank has two elements.
You have no hot water, and tank has power to upper element.
Lower element has no power.

Something doesn't sound right.
You're not testing correctly.

Before doing anything, test across top two screws of upper element for 240Volts.
This will eliminate electrical problem as suspect.
Breaker must deliver 120V on both legs to complete the 240V circuit.
Every single-phase household circuit takes 2 wires to complete the circuit.
With 120V you need 1 neutral wire and 1 hot wire to complete circuit.
With 240V you need 2 hot wires, one from each hot busbar, to complete circuit.
Your water heater can appear to have electricity if breaker is delivering power on one leg of the 240V circuit.
To check breaker for sure, move wires to another similar size breaker to see if water heater functions properly.
http://waterheatertimer.org/B220C.html

If 240V circuit is good, then next thing is take 30 minutes and do full test of water heater parts.
This will identify exact problem(s) without guessing.
Buy 5$ multimeter from Home Depot. Install battery.
When test calls for continuity, rotate dial to Ohms (upside down horseshoe is ohms).
When test calls for testing voltage, rotate dial to 240-250-277 VAC
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Add a comment for more help.

Dec 28, 2010 | Rheem Water Heaters

1 Answer

No hot or warm water what is the voltage reading susposed to be on the heating elements? I have 122 volts on each terminal on both elements but no action, what am i doing wrong?


If water is totally cold, then upper element is not getting 240V. Since element tested for 120V, then that says upper element is burned out, upper thermostat is bad, or circuit breaker is bad.
Best thing is to buy multimeter and do 30 minute troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Also read information below for understanding how water heater works.

Testing elements for voltage can be misleading.
If water heater has 2 elements, then tank is 240Volts.
240V water heaters have 120V on each element at all times.
So elements have hot 120V power, but they are not turned on until the circuit is complete with 240V.
Open following links to read specifics about 120V and 240V
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/How-water-heater-thermostat-works.html

240V is made from two 120V Hot wires from breaker box.
Each 120V line from breaker is called a 'leg.'
So 240V circuit has two legs, and both legs need to be turned on to complete 240V circuit.

Water heater thermostats turn off only one leg.
The other leg is Hot all the time.
So when you test screws on an element, for example test between a screw and any bare metal part of tank, then the screw will always show 120V.
That is just one leg of the 240V circuit.
But the 240V circuit is not turned On until both legs are connected.
Every residential circuit needs two wires to complete the circuit, and in the case of 240V, those two wires are both 120V.

When the thermostat turns on, it turns on the second leg to the element and that completes the 240V circuit.
http://waterheatertimer.org/How-it-works.html

Dec 16, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Installed new upper & lower elements & thermostats, only top htr works


If original problem was caused by sediment burning out lower element, did you clean sediment out of water heater when changing lower element?
Two element water heaters are 240V.
Thermostats cut power on one hot wire, but 240V circuit has 2 hot wires. So lower element has power at all times coming from the red wire.
1) Use ordinary tester or multimeter set to 240V <> test each screw of lower element to bare metal part of water heater. Each screw should show 120V. If there is no power, then upper thermostat is defective, screw on upper thermostat is loose, or red wire between upper and lower parts of water heater is bad.
2) Remove wires from lower element. Use continuity tester or multimeter set to ohms <> test across both screws of element to see if power travels through element <> if element is bad, then continuity tester will not light up and multimeter will show no ohms. Put wires back on element after test.
3) Start with cold water in tank. Turn on water heater & upper element will turn on. Put ear on side of tank to hear if upper element is heating water. Test #3 screw to #2 screw on low left side of thermostat, should read 240V > Test #3 screw to #4 screw on low right side of thermostat, should read 0V.
Put ear on side of tank. When upper element turns off: Test #3 screw to #2 screw on low left side of thermostat, should read 0V > Test #3 screw to #4 screw on low right side of thermostat, should read 240V. If this test shows 0V and 0V, then upper thermostat is bad. If reading is correct, immediately move to next test.
http://waterheatertimer.org/images/Thermostats-numbered-divided-500.jpg
4) Turn temp on lower thermostat to 150. Using ordinary tester or multimeter set to 240V <> Test across both screws of lower element. If there is no reading, and you know element is good from step 2, then lower thermostat is bad, or wire is bad between lower element and lower thermostat, or wire is bad between lower thermostat and top part of heater.
5) Test across both lower thermostat screws, should read 240V.If this test is good, it means wires are good. Put jumper wire across both screws of lower thermostat, and test lower element again. If element finally turns on with jumper wire, then lower thermostat is bad.
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http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

If wire is bad between upper and lower parts of water heater, and water heater has tight-fitting 2" foam insulation, it usually indicates water heater replacement.

Sep 20, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Can the board be changed easily on the ex 120 tc or do i need an electrician?


If you have the parts, replacement is a no brainer. Take few pictures with your digital camera or label the wires before you start

Feb 12, 2010 | Eemax EX120TC 11.5kW 240V

1 Answer

I can't get 240v across the bottom element. Where should I start? Shouldn't it have 240v across it? I can ground one side of the meter to the tank and can get 120v to each side, but not 240v across the...


If that is indeed so you have a "Short" between Phase and Earth. .. YES one should have the mains Voltage across the Load, But NEVER anything between Phase & Earth. Look think of it all like this. The Phase comes in, to a, say, a switch, from switch, to thermostat, from thermostat, to One Side of the "Load" Element. The "Other side of that "Load" Element then goes to Neutral. Circuit Complete. Two elements, wired in series would indeed split the Voltage, if wired that way. If done like this, but if wired in parallel, then, again Both would have One End, connected to Phase, & the "Other" side(s) would go to Neutral. Thus the circuit is complete. Some setups are more complex, and use two elements. but essentially all the same. The elements could be wired in series or parallel, depending on current draw/resistance. The Phase is the wire always "Broken" and the Neutral is always "Common".
BE CAREFUL.

Feb 10, 2010 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

My eemax ex120tc 11.5kw 240v the water does not get hot enough.


you can check elements with a meter to see if they are any good. how old is heater?

Feb 04, 2009 | Eemax EX120TC 11.5kW 240V

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